Steppers & Linear encoders

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08 Nov 2020 21:43 #188701 by Joco
Replied by Joco on topic Steppers & Linear encoders
There is also some good info on PID tuning here:
gnipsel.com/linuxcnc/tuning/index.html

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08 Nov 2020 21:50 #188702 by tommylight

@Joco, off topic,
quote from ? :
I have a head the size of a planet ....
:)

If I get this correctly, the quote was from Ronald's previous message. Have updated my response to make that linkage. :-)

Nope, your avatar is from a movie and a book named "hitch-hikers guide through the galaxy", the book has written "don't panic" on the cover with big letters ! :)

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08 Nov 2020 21:57 #188703 by Joco
Replied by Joco on topic Steppers & Linear encoders

@Joco, off topic,
quote from ? :
I have a head the size of a planet ....
:)

If I get this correctly, the quote was from Ronald's previous message. Have updated my response to make that linkage. :-)

Nope, your avatar is from a movie and a book named "hitch-hikers guide through the galaxy", the book has written "don't panic" on the cover with big letters ! :)


lol - "Don't talk to me about life ... "
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08 Nov 2020 22:08 #188705 by tommylight

@Joco, off topic,
quote from ? :
I have a head the size of a planet ....
:)

If I get this correctly, the quote was from Ronald's previous message. Have updated my response to make that linkage. :-)

Nope, your avatar is from a movie and a book named "hitch-hikers guide through the galaxy", the book has written "don't panic" on the cover with big letters ! :)


lol - "Don't talk to me about life ... "

Exactly ! :)
End of off topic.

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09 Nov 2020 19:43 #188787 by Ronald J
Replied by Ronald J on topic Steppers & Linear encoders
Dear James,
This is great information.
So, because of the great info from you and AndyPugh, I will now finaly launch and purchase all the required core-components.
I updated the Functional-Diagram (As PDF attached) , maybe any of you notice some inconsistencies.

This browser does not support PDFs. Please download the PDF to view it: Download PDF



Using pncconf, I will also post the initial HAL & INI files generated by Pncconf, maybe you can show to initial steps what you would "touch" or modify to the one generated. Then I'll try to take it from there and report on how the System Responds.

P.s:
Where can I find more examples of builds, like the one I started to draw-down? Does any of you have a good source of Block-Diagrams + HAL&INI's for LinuxCNC converts ?

But Great feedback so far and great work guys, thanks !

R.
Attachments:

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11 Nov 2020 04:09 - 11 Nov 2020 04:15 #188954 by Ronald J
Replied by Ronald J on topic Steppers & Linear encoders
Dear James, dear Andy,

please find attached what I have found out so far in connecting my Lathe to a MESA 7i96+7i85s.


I used pncconf for the 7i96, but had to choose the 7i84 daughterboard, as the 7i85 is not found in pncconf.
My Assignment you can find here in the PDF:

This browser does not support PDFs. Please download the PDF to view it: Download PDF



Then I generated the HAL & INI File, also here attched:

File Attachment:

File Name: SD300_7i96...i85s.hal
File Size:11 KB

File Attachment:

File Name: SD300_7i96...i85s.ini
File Size:4 KB


And now comes the magic:
1. What do I need to do, to correct the pin-mapping made for the 7i84 in pncconf, to work for the 7i85 ?
2. How would (After a successfull 7i85 pin mapping) the HAL/INI File modification-process look like, to get a full loop-back control in place for spindle, Linear-X & Linear-Z Encoders, using the example I generated so far?

I think after these two guiding steps from your side, I would be able to start crawling (And hopefully also help other Linuxcnc starters with this example).

Best regards,

Ronald
Attachments:
Last edit: 11 Nov 2020 04:15 by Ronald J.

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11 Nov 2020 04:36 #188955 by PCW
Replied by PCW on topic Steppers & Linear encoders
Adding a 7I84 will not be helpful

To add encoder feedback you would start with a plain 7i96 configuration
and then add the encoder setup in the hal file and encoder scaling in the
ini file. Then you would change the position feedback source from the stepgen
to the encoder.

To do this you should start with a working open loop stepper system
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13 Nov 2020 22:46 #189264 by Joco
Replied by Joco on topic Steppers & Linear encoders
Have a look at this thread:
forum.linuxcnc.org/49-basic-configuratio...-loop-setup?start=20

I think Hakan is using the same board setup that you are and he has posted his HAL and INI files. You should be able to see the required "loadrt hm2_eth_board_ip=" line that pics the needed firmware and associated parameters.

I have not gotten to the ethernet side of things myself. I'm still using PCI based kit.

Cheers.
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